No option for people to 'post a comment' on my blog page. (5 posts)

Hi, i've just got my site up and running and all in all, i'm very happy with how WordPress deals with it all.

Only problem I have is there's no 'post a comment' option on my blog page ( Cosmic-Robot.com link here ). I've seen others post this issue too and I think i've done everything that has been suggested for this issue.

I've ticked the 'allow comments' on the 'edit page' screen.

In Settings/Discussion i've ticked the 'Allow people to post comments on new articles' box. Users do not have to sign in or register to post.

Thanks for the response guys. Firstly @ alchymyth, I haven't edited the comments.php of the theme as far as i know. I switched to Twenty Twelve as you suggested but still no 'add comment' button. I also disabled all plug-ins again (I only have 7 active to be honest), but as before, there's no change.

@ Seacoast Web Design, I see what you mean about the post title being hidden, but I've no idea why it is, or how to un-hide it. This is my first blog so didn't realise how it should look, ie: with a title. I don't see anything on the page set-up to either hide or unhide titles. Is there a way to turn them back on?
Also, no idea why there a redirect on the post, or even what that means really. The plug-ins i have active are as follows:

AJAX Thumbnail Rebuild, Backup, Contact form plug-in, Facebook button plug-in, Jetpack by wordpress.com, Maintenance Mode, and Official Statcounter Plug-in. I've checked the settings of each but can't see anything obvious.